package com.hmdp.utils;

import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;

import java.util.Collection;
import java.util.Collections;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

public class SimpleRedisLock implements ILock{

    private String name;
    private StringRedisTemplate stringRedisTemplate;
    private static final String KEY_PREFIX = "lock:";
    private static final String ID_PREFIX = UUID.randomUUID().toString().replace("-", "") + "-";
    private static final DefaultRedisScript<Long> UNLOCK_SCRIPT;
    static {
        UNLOCK_SCRIPT = new DefaultRedisScript<>();
        UNLOCK_SCRIPT.setLocation(new ClassPathResource("lock/unlock.lua"));
        UNLOCK_SCRIPT.setResultType(Long.class);
    }

    public SimpleRedisLock(String name,StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean isLock(long timeoutSec) {
        String threadId = ID_PREFIX+Thread.currentThread().getId();
        Boolean result = stringRedisTemplate.opsForValue().setIfAbsent(KEY_PREFIX + name, threadId , timeoutSec, TimeUnit.SECONDS);
        return Boolean.TRUE.equals(result);
    }

    @Override
    public void unLock() {
        stringRedisTemplate.execute(UNLOCK_SCRIPT, Collections.singletonList(KEY_PREFIX+name),ID_PREFIX+Thread.currentThread().getId());

    }
//    释放锁
//    @Override
//    public void unLock() {
//        String threadId = ID_PREFIX + Thread.currentThread().getId();
//        String id = stringRedisTemplate.opsForValue().get(KEY_PREFIX + threadId);
//
//        if(threadId.equals(id)){
//            stringRedisTemplate.delete(KEY_PREFIX + name);
//        }
//    }
}
